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The charging system on your vehicle is computer controlled . The ECM - engine computer turn's on the battery light if it think's there is a problem . Sends a message to the instrument cluster over the class 2 serial data network . Have you had the vehicle checked for DTC's diagnostic trouble code's ?
Is the red light in the center of the dash , on top of dash panel not instrument cluster flashing when trying to crank the engine over ? If yes you have a anti theft system problem ! If the light is not flashing you can check for power an ground an PCM control at the starter relay in the under hood battery junction box ! Bottom of relay or side show pin numbers ! Pin's 30 & 86 should have battery voltage ! Pin 87 - ground through the starter , Pin 85 should have nothing unless cranking engine over . The PCM supply's a ground here energizing the starter relay ! You can also test this by using a test light . The clamp end to battery positive , the point end touch to pin 85 relay socket while cranking ! Test light should light !
Two years ago I purchased an 05 Lesabre and the cluster lights on my dash all went out and the dealer said he thought it was a fuse. Fuses were ok. My battery was shot and he said because it was making the alternator charge at a high charge all the time it burnt out all my cluster lights. He replaced the battery and the cluster lights as well.
it is not dangerous to drive but the reason why the battery light is on is because the charging system is not working right. the battery could be faulty or the alternator is bad.
You can replace the instrument cluster bulb with a regular halogen bulb, or use T5 led bulbs that come in a variety of colors (white, blue, etc.) They are inexpensive and will last a lot longer than the regular halogen bulbs.
Replacing the faulty bulbs isn't too hard for DIY.
For help: Moonlight Driving
I have seen this before and found the Dash insert is defective, Go to
address 17 and carry out a final control segment test for the dash when
the fault occurs also make sure there are no battery management fault
codes.
Restriction of functions
The following are deactivated in the event of
active load intervention by the battery and
energy management system:
- Interior lighting
- Sunroof
- Light/humidity sensor
- Interior mirror
Check you ambient in car lighting settings in the mmi user functions for current settings
Park brake uses 58d terminal and the rest use 58s terminal from memory
The dash cluster has to come out, to get to the bulbs. The battery has to be disconnected. dash bezel around the cluster will pop off,usually a small flat screwdriver will help pop off the bezel. be careful not break the bezel, very thin abs material. after removing bezel, there will be maybe 4-6 small screws holding the cluster in. remove these screws and the cluster will pull out, be careful her also as there are wire behind here and connected to the cluster. the bulb will easily come out with a slight turn.
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